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1. FIRE PRODUCTS
For more information, call 1-800-888-4784 (4STI) or visit www.sti-usa.com
KEY features
General Information
· For use in areas where temperature
or environmental conditions exceed
the operational range of UL Listed
devices.
· Heater unit cycles as required
to maintain the correct range of
operating temperatures.
· Fan runs continuously to maintain
a uniform temperature inside the
enclosure.
· Maintains operating temperature
with external temperatures to -70°F
(-57°C).
· Three year guarantee against
breakage of polycarbonate in
normal use (one year on electro
mechanical and electronic
components).
Design
· The Stopper II design is a registered
trademark of Safety Technology
International, Inc.
Construction
· UL Listed to U.S. and Canadian
safety standards. See reverse side
for details.
· Enclosure rated to NEMA 3R
Standards.
· The thick, clear polycarbonate
cover is UV-stabilized against
discoloration.
Installation
· UL/cUL Listing requires outdoor
rated stations.
· Typical working properties of
polycarbonate are -40° to 250°F
(-40° to 121°C).
Electronics
· UL Listing does not require standby
or secondary power for 110 or 140
VAC 60 Hz heater.
Options
· 110 VAC or 240 VAC heater.
Product Overview
This protective cover has been helping stop false fire alarms around the world for
more than 30 years, without restricting legitimate alarms. This Stopper II enclosure
with heater allows addressable dual monitor modules to be installed inside or outside
in temperatures below UL Listing limits or in other NEMA 3R environments. UL/cUL
Listing requires outdoor rated stations. The cover offers excellent protection against
physical damage (both accidental and intentional), as well as other environments inside
and outside. Also ideal for inside of walk-in freezers.
how it works
Stopper II Heated Enclosure consists of a clear, super tough polycarbonate shield,
frame and heater. The Stopper II is mounted on a NEMA 3R enclosure with a heater
which allows an addressable manual pull station to be installed inside or outside in cold
temperatures.
STI Stopper II®
HEATED ENCLOSURE
STI-1200A-HTR
ADACompliant
ADACompliant
®

2. Printed in U.S.A., © 1987-2009 Safety Technology International, Inc.
2306 Airport Road
Waterford, Michigan
48327, USA
Tel: 248-673-9898
Fax: 248-673-1246
Toll-free: 800-888-4784
info@sti-usa.com
www.sti-usa.com
Unit 49G Pipers Road
Park Farm Industrial Estate
Redditch, Worcestershire
B98 OHU England
Tel: 44 (0) 1527 520 999
Fax: 44 (0) 1527 501 999
www.sti-europe.com
04/11Subject to change without notice.
approvals warranty
TESTING
It has been tested and approved or listed by:
· UL, cUL Listed S2466 (requires outdoor rated station)
· UL File S7025 is cross referenced to File S2466 permitting STI
Stopper®
Stations, non fire, in category UEHX and Listed to UL
2017 for outdoor use
· ADA Compliant
WARRANTY
Three year guarantee against breakage of polycarbonate in normal
use (one year on electro mechanical and electronic components).
WARNINGS
The enclosure is used to protect UL Listed 38 and 2017 manual
initiating outdoor listed devices at temperatures down to -70˚F
(-57˚C). It is the installer’s responsibility to comply with NEC 70
Articles 725 and 760, NFPA 72, and other applicable fire and
electrical codes. Conduit or raceway paths need to be sealed as
near to the enclosure as possible. Installer should have maintained
supervision over the low temperature thermostat. The low
temperature monitoring thermostat makes the circuit at +32°F (0°C)
and clears the circuit at +50°F (+10°C). This listing requires that the
fire alarm supervisory control module be only of the latching type.
On the appliance mounting plate is a label where you should record
the installation date. Also includes serial number and installation
date on the instruction sheet for quick reference.
STI Stopper II®
Heated Enclosure
Dimensions and Technical Information
modelS available
STI-1200A-HTR With 4 in. deep backbox - 110 VAC
STI-1200A-HTR240 With 4 in. deep backbox - 240 VAC
Accessory
STI-HK3 Replacement heater
SPECIFICATIONS
INTERNAL DIMENSIONS:
PART # HEIGHT WIDTH DEPTH
1200A-HTR 6.25 in. 4.125 in. 1.25 in.
1220A-HTR240 (158mm) (104mm) (31mm)
POLYCARBONATE ENCLOSURE:
Flammability: UL94 V-2
Wall Thickness: backbox: .20 inches (5.1mm)
cover: .12 inches (3.1mm)
NEMA Rating: 3R
Warranty: Lifetime against breakage in normal use (one
year on electronics from time of installation)
SILICONE LAMINATE HEATER:
STI-1200A-HTR 110 VAC 50/60 Hz UL Recognized Component
STI-1200-A-HTR240 240 VAC 50/60 Hz UL Recognized Component
100 Watts
Life: @ -10°C (14°F) ~ 70°C (158°F) 5 years
Duty Cycle: -40°F (-40°C) 16%
-70°F (-57°C) 38%
-99°F (-73°C) 100%
FAN:
24 VDC (±10%), 90 mA UL Recognized Component
Life: 5 years continuous duty
WARNING: The polarity of the circulating fan is important as it only
rotates in one direction with red lead being positive.
SEALING HUB
(NOT PROVIDED)
3/4 in. NPT MALE NIPPLE
(NOT PROVIDED)
MOUNTING TAB
(4) PROVIDED
BACKBOX
#10 x 1 1/2 in.
PAN HEAD SCREW
(4) PROVIDED
MOUNTING
SURFACE
SCREW ANCHORS
(4) PROVIDED
#6-32 x 1 in. PAN HEAD SCREW
(4) PROVIDED
3/8 in. STANDOFF
DUAL MONITOR
ADDRESSABLE MODULE
(NOT INCLUDED)
LOW TEMP WARNING
THERMOSTAT
24 VDC TERMINAL BLOCK
PULL STATION
(NOT INCLUDED)
#8-32 x 3/8 in.
FLAT HEAD SCREW
SLIDE PLATE
HIGH VOLTAGE TERMINAL BLOCK
FAN
CIRCUT BREAKER
COVER
IN CASE OF
PULL
FIRE
GASKET
3/4 in. NPT MALE NIPPLE
(NOT PROVIDED)
SEALING HUB
(NOT PROVIDED)
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
0:00:00:00.00
0:00:19:59.70
0:00:39:59.70
0:00:59:59.70
0:01:19:59.70
0:01:39:59.70
0:01:59:59.70
0:02:19:59.70
0:02:39:59.70
0:02:59:59.70
0:03:19:59.70
0:03:39:59.70
0:03:59:59.70
0:04:19:59.70
0:04:39:59.70
0:04:59:59.70
0:05:19:59.70
STI-1200A-HTR
TIME
TEMP(Deg.C)
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
0:00:00:00.00
0:00:19:59.70
0:00:39:59.70
0:00:59:59.70
0:01:19:59.70
0:01:39:59.70
0:01:59:59.70
0:02:19:59.70
0:02:39:59.70
0:02:59:59.70
0:03:19:59.70
0:03:39:59.70
0:03:59:59.70
0:04:19:59.70
0:04:39:59.70
0:04:59:59.70
0:05:19:59.70
STI-1200A-HTR
TIME
TEMP(Deg.C)
TC-1 TC-2 TC-3 TC-4 TC-5 External Temp
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
-70
-80
Temp
DEG C
STI-1200A-HTR
00:00
00:30
01:00
01:30
02:00
02:30
03:00
03:30
04:00
04:30
05:00
UP
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